Metal-working machine.



UNITED sTATEs PATENT oEEicE,

BENGT M. W. HANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNE COMPANY, F HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

METAL-WORKING MACHINE.

Patented oct. 1o, 1916.

Application'led M'arch 2, 1915. Serial No. 11,492.

To all 'whom it may concern Be it known that I, BENGT'M. W. HAN- soN, a citizen of the United States, residing at Hartford, in the county of Hartford and -State of-f'lonnecticut, have invented certain new and useful` Improvements in Metal- Working Machines, of which the following is a specification.

This invention relates to metal-working o machines, the primary object of the invention being to provide means of an effective character for maintaining the work in solid and substantial relation with a tool during the action of the latter upon the former and a at the same time for causing the work to recede from or clear the tool at the conclusion'of such action'and preferably until a repetition of such action. By reason of the construction mentioned I can insure proper results without marring 0r injuring the Work of whatever nature the same may be.

In the drawings accompanying and forming part of the present specification I have i illustrated in` detail one of the several convenient forms of embodiment of the invention which to enable those skilled in the art to ractise the same will be set forth in the fol owing description. As will be inferredv I do not restrict myself to this particular o disclosure.; I may Ydepart therefrom in several respects within the scope of the'invention defined by the claims following said description.

Referring to said drawings: Figure 1 is i' a top plajn -view of a metal-working machine involving my invention, with the head stock removed. Fig 2 is a vertical sectional view of said machine.

Like characters refer to like parts in i both views;

As will be understood I may. embody my invention in -machines of various kinds, although it is of particular advantage when incorporated'in a milling machine as illustrated inisaid drawings. The dil'erent parts v of the machine may be mounted upon a suitable frame; that shown comprises the base or bed 2 provided upon its top with suit.-

able ways to receive for reciprocatory slidmg movement the slide 3 constituting a suitable movably mounted work-carrier-.

to receive the depending stud .G on said' vwork-carrier or sl1de.

Said cam drum is suitably fastened tothe shaft 7 extending longitudinally of the machine, thev shaft and hence theA cam drum being preferably continuously rotated in any proper manner, As the drum 4 rotates it' first advances and then retracts the Awork carrier or slide 3.

The tool as already noted may be of any desired type; that shown is denoted by 8 and consists of a milling tool being fastened to the spindle 9 supported by the head stock 9 rising from and suitably rigidly connected with the base or bed 2. The reciprocatory work-carrier or slide 3 sustains in some suitable manner a work-holder. to

which the work is connected rigidly. This work-holder may vary decidedly as to construction, although it should be movably mounted. The work-holder 10 answers properly my requirements, it being shown as pivoted at one end as at 11 to a bracket Aor bearing 12 rising fromthe work carrier or slide 3. It will therefore be evident that said work-holder 10 can be moved into and out of operative positions, which as shown are up and down. Any suitable means may be vprovided for securincr these actions in sequence. I will hereinafter describe means which satisfactorily answer in this respect. The workA is usually connected with the work-holder 10 by a vise or clamp, that denoted by 13 answering satisfactorily. The

vise 13 is rigid with the work holder 10 and as shown it is located on the upper side of the latter' at the' ends thereof opposite the pivot end.

At a predetermined point in the -movement of the work carrier or slide 3 the work holder is moved to operativev position to bring the surface of theworlr which is to" be operated upon into the cutting plane,

eov

,the work holder isa 'work' carrier or slide 3, the Work will be under the operation o'f the' tool and for another period entirely free or clear of said tool.

To insure proper cutting by preventing chattering of the work, the work holder 10 when in operative position, that is elevated 1n the construct-ion'shown, is non-yieldingly held, best -obtained by having said work holder bear against a suitablerigid stop or vabutment as 14 which as shown consists of a plate fastened as by oneor more screws 15 to the block 16 rigid with the Work carn rier or slide 3. The overhanging or active portion of this plate is adapted to cooperate with the projection or extension 17 at the free lower end of the work holder 1'0.v At

the proper point in theoperation ofthe m'a' chine or practically Work is to be milled, vated tov carry 17 solidly and substantially against the inward over-hangingA portion' of the plate 14, and this relation 1s continued until the milling tool has nished its cutupon the work. Said stopv or abutment 14 constitutes, as will be clear, a convenient means for preventing reactive movement ofthe work holder 10 and therefore of the 'work rigidly mounted on said work holder while the cutter 8 is milling or otherwise operating upon the work. At `this point the work holder is caused to lower, this movement in the present instance being a gravitative one. The work holder remains in its inoperative or lowered position until the time that a Second just 'before the piece of the work holder is elecut should be made.

Supported by suitable bearings on the slide 3 is the shaft 18 to which is fastened a cam as 19 cooperative with the work holder. 10. Fastened to said shaft 18 is the pinion 20 in mesh with the teeth of the rack bar 2l supported for reciprocation by suitable bearings or brackets as 22 upon the bar 21 is adapted to co4 slide. 3. This rack v operate in alternation With'suitable actuating members which as shown consist of dogs as 23 and 24 rigid Vwith the base or bed 2 of the machine. v

In Fig.' have shown b y the arrow the direction fofro'tat'ion of the milling cutter 8 and byga second arfrow the direction of advancin'g,r movement of fthe slide 3. Just after the cutterS has inihed its operation upon point cutting or milling jection 17 firmly said projection orl extension a reciprocatory slide,

tion ofthe slide,

the work, the forwardend of the rack bar Apinion 21 and hence the shaft 18 and cam 19 will be Irotated in such -manner as to cause the cam to permit the work holder 10 to descend and the movement of the projection 17 away from the stop 14, the work in the-vise 13 as the vise descends with the work holder 10 being moved below ,the cutting plane. Just after the several parts mentioned are lowered reverse or retractive movement ofthe slide 3 is effected by the cam drum 4. A short interval of time before the slide 3 has completed its retractive or lreverse movement the outer or leftend of the rack bar 21 will strike the stop 23, thus causing relatively a forward movement of said rack bar and the rotation of the p inion 21, shaft 18 and cam 19, so that the cam as it thus rotates can act on the under side of the Work holder 10'to move the prolast part of the retractive movement of the slide, so that when the slide is advanced byv the drum 4 in the manner already described, the work in the vise 13 will be in the cutting plane. It will be clear that the work islowered after a cut has been made and is maintained in this relation until before a against the rigid stop 14,4 the extension engaging the stop during the second cut is to be made, so that'l on the backward movement of the slide 3, the cutter can in no wise afl-ect the work. i

The vise 13 is familiar inthis art and'needs no detailed description. It is obvious that it non-yieldingly clamps or engages the work and that in turn it is non-vieldingly or rigidly supported upon the work holder 10 which as shown has a way as 10 to receive a tongue or equivalenton the vise and thus provide for longitudinal adjustment of the latter. l What I claim'is: f

l. A metal-Working machine comprising a work holder pivotally supported on the slide and "automatic means for causing the raising and lowering of the work-holder relatively to the slide at' predetermined points in the reciprocation thereof, and means for preventing reactive movement of the work-holder when the same is in the raised position thereof.

2. A metal-working machine comprising a reciprocatory slide, a work-holder'pivotally supported by the slide, va pair of fixed elements supported independently of the slide, and means actuated by said fixed elements atpredetermined points in the reciproca. for causlng the raising and otally supported by points in the reciprocation lowering of thwork-holder relatively toV holder with respect to said slide.

mately at 4. A metal-working machine comprising a reciprocatory slide, a work-holder pivotally supported on the slide, a milling tool in cooperative relation with the work-holder' and means for operating upon the work-holder to cause the work to be positioned for milling before-the work reaches the tool and for causing the action of the work-holder to carry the work free of the tool approxithe conclusion of a milling operation.

5. A metal-working machine comprising a reciprocatory slide, a work-holder pivotally supported on the'slide and means for causing the work holder to move away from 40 matically raising the work holder ing lowering ot' the 60 ing it in said inoperative position lor and to then approach the slide at predetermined points in the reciprocation of the slide. 6. A metal-working machine comprising a reciprocatory slide, a work-holder piva0 otally supported on the slide and means for causing the work-holder to move away from and to then approach the slide at predetermined points in the reciprocation of the latter, and a fixed element on the slide to he 85 engaged hy the work-holder when the same is in a position away from the slide.

7. A. metal working machine comprising a reciprocatory slide, a work holder pivotally supported on the slide, means for autowhen the at the limit ot its retracnniintaining it in the elevated position until the advancing movement is practically completed and Jfor caussame at the conclusion of the advancing movement and for maintaining the work holder lowered until a second retractivo movement has heen practically completed, a rigid stop engageahle hy the slide is practically tive movement, i'or work holder when in the elevated position,

and a tool to operate upon the work when the work holder is in the elevated position.

H. A metal-working machine comprising a reciprocatory slide, a work-holder pivotally supported on the slide, mechanism lor movlng and l'or non-yieldingly holding the, work-holder in operative' position l'or a predetermined time and for movingr the workholder to inoperative, position and maintaina predetermined time and a, tool to aet onI the work carried hy the work-holder when the hitter isin its operative position.

l). The combination ol' a rta'iprmzatory G5, slide, a work holder pivotally mounted on predetermined point in the slide, a rigid stop carried by the slide, a

pinion supported byv the slide, a reciproca- A work holder approximatelyV at the conclusion of the retractive and advance movements of the slides, the work holder when elevated engaging said stop, and a tool to operate on the work when the work holder is elevated. 10i A metal working machine comprising a reciprocatory slide, a work holder pivotally mounted on the slide, automatically operative means whereby the work holder is non-yieldingly swung upwardly with respect to the slide at a predetermined point in the movement of said slide, and fixed stopv means on the slide engageable by the work holder when in the elevated position thereof.

11. The combination of a work carrying member provided with Work' supporting means, automatic means for' moving the work carrying member forwardly and backwardly, a cutting tool to mill the work on the forward movement of the work carrying member, and automatic mechanism for causing a swinging movement of the work at a the advance of the work carrying member to move 'the work across the cutting plane of the tool and to position the Work to be milled and for causingopposite swinging movement of the work at the conclusion of the milling operation and for preventing reactive movement of the work while the same is being milled.

12. The combination of a work carrying memher provided with work supporting means, automatic means for moving the work carrying memher forwardly and-haekwardly, a cutting tool to mill the work on the forward movementl of the work carrying member, and automatic mechanism for causing a swinging movement ot' the work at a predetermined point in the forward movement of the work carrying memher to nieve the work across the cutting plane of' the tool and position the work to he milled, for swinging the work in the opposite direction at the conclusion ol" the milling operation andl Jlor non-yeldingly positively preventing opposite movements ol the work during the ini/ lLing operation.

l. 'lhe combination ot a work carrying memher provided with work supporting means, automatig'. means for moving the work carrying memher forwardly and hackwardly, a cutting tool to mill the \vork on the forward movement ol' the work carrying memher, and automatic mechanism vfor eausv ing a, swinging movement of the work at a predctermimal point in .the Vforward movement of the Work carrying member tov move ber for receiving the reactive thrusts4 of the v the Work across thecutting plane 'of the tool Work. i v Y 10 and position the Work to-be milled, for swing- In testlmony Whereof I aix myvv slgnaing the Work in the opposite direction at the ture in presence of two witnesses.

5 conclusion of the milling operation and for BENGT M. W. HANSON. also non-yieldingly holding the Work in po- Witnesses: Y sition to be milled, and relatively lixed W. H. STORRS,

means movable with the Work carrying mem- C. M. GEILERT. 

